Create an iterator which computes the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
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> Create an [iterator][mdn-iterator-protocol] which iteratively computes the [angle][@stdlib/math/base/special/atan2] in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
``bash`
npm install @stdlib/math-iter-special-atan2
`javascript`
var iterAtan2 = require( '@stdlib/math-iter-special-atan2' );
#### iterAtan2( y, x )
Returns an [iterator][mdn-iterator-protocol] which iteratively computes the [angle][@stdlib/math/base/special/atan2] in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
`javascript
var array2iterator = require( '@stdlib/array-to-iterator' );
var x = array2iterator( [ 2.0, 2.0, -1.0 ] );
var y = array2iterator( [ 2.0, 6.0, -1.0 ] );
var it = iterAtan2( y, x );
// returns
var r = it.next().value;
// returns ~0.785
r = it.next().value;
// returns ~1.249
r = it.next().value;
// returns ~-2.356
// ...
`
The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:
- next: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
- return: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.
If provided a numeric value as an [iterator][mdn-iterator-protocol] argument, the value is broadcast as an infinite [iterator][mdn-iterator-protocol] which always returns the provided value.
`javascript
var array2iterator = require( '@stdlib/array-to-iterator' );
var y = array2iterator( [ 2.0, 6.0 ] );
var it = iterAtan2( y, 2.0 );
// returns
var v = it.next().value;
// returns ~0.785
v = it.next().value;
// returns ~1.249
var bool = it.next().done;
// returns true
`
- If an iterated value is non-numeric (including NaN), the returned [iterator][mdn-iterator-protocol] returns NaN. If non-numeric iterated values are possible, you are advised to provide an [iterator][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly.Symbol.iterator
- The length of the returned [iterator][mdn-iterator-protocol] is equal to the length of the shortest provided [iterator][mdn-iterator-protocol]. In other words, the returned [iterator][mdn-iterator-protocol] ends once one of the provided [iterators][mdn-iterator-protocol] ends.
- If an environment supports and a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
`javascript
var uniform = require( '@stdlib/random-iter-uniform' );
var iterAtan2 = require( '@stdlib/math-iter-special-atan2' );
// Create seeded iterators for generating pseudorandom numbers:
var x = uniform( -2.0, 2.0, {
'seed': 1234,
'iter': 10
});
var y = uniform( -2.0, 2.0, {
'seed': 4567,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterators:
var it = iterAtan2( y, x );
// Perform manual iteration...
var r;
while ( true ) {
r = it.next();
if ( r.done ) {
break;
}
console.log( r.value );
}
`
*
- [@stdlib/math-base/special/atan2][@stdlib/math/base/special/atan2]: compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
- [@stdlib/math-iter/special/atan][@stdlib/math/iter/special/atan]: create an iterator which computes the arctangent of each iterated value.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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[mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol
[@stdlib/math/base/special/atan2]: https://www.npmjs.com/package/@stdlib/math-base-special-atan2
[@stdlib/math/iter/special/atan]: https://www.npmjs.com/package/@stdlib/math-iter-special-atan